491. The use of strain type insulators is made where the conductors are__________?
A. dead ended
B. at intermediate anchor towers
C. any of the above
D. none of the above

492. The current drawn by the line due to corona losses is___________?
A. non-sinusoidal
B. sinusoidal
C. triangular
D. square

493. Pin type insulators are generally not used for voltages beyond_________?
A. 1 kV
B. 11 kV
C. 22 kV
D. 33 kV

494. Aluminium has a specific gravity of___________?
A. 1.5
B. 2.7
C. 4.2
D. 7.8

495. For transmission of power over a distance of 200 km, the transmission voltage should be_________kv?
A. 132 kV
B. 66 kV
C. 33 kV
D. 11 kV

496. For aluminium, as compared to copper, all the following factors have higher values except:
A. specific volume
B. electrical conductivity
C. co-efficient of linear expansion
D. resistance per unit length for same cross-section

497. Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical?
A. Static condenser
B. Synchronous condenser
C. Tap changing transformer
D. Booster transformer

498. In a tap changing transformer, the tappings are provided on__________?
A. primary winding
B. secondary winding
C. high voltage winding
D. any of the above

499. Constant voltage transmission entails the following disadvantage?
A. large conductor area is required for same power transmission
B. short-circuit current of the system is increased
C. either of the above
D. none of the above

500. On which of the following factors skin effect depends?
A. Frequency of the current
B. Size of the conductor
C. Resistivity of the conductor material
D. All of the above

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